ACM Research
Supplies wet-cleaning and adjacent process equipment for wafer fabrication and advanced packaging.
$75.46
After-hours close+1.06 (+1.42%)
At close$74.40(−7.57%)
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Breakdown13F · Form 4
Institutions 88.15%56.52M sharesInsiders 2.37%1.52M sharesOther 9.48%6.08M shares
Shares outstanding 64.12M · Float 58.44M · 91.1% free float
Institutions13F, as of Jun 30, 2026
402 holders · 56.52M shares · 124 new positions · 250 increased · 94 reduced · 47 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 8.66M | 13.51% | +676.0K | Aug 7, 2026 |
| Vanguard Portfolio Management LLC | 3.35M | 5.22% | +1.15M | Aug 13, 2026 |
| Vanguard Capital Management LLC | 2.46M | 3.84% | +198.4K | Aug 13, 2026 |
| Capital World Investors | 2.40M | 3.74% | +2.40Mnew | Aug 12, 2026 |
| State Street Corp | 2.19M | 3.41% | +182.1K | Aug 7, 2026 |
| Geode Capital Management, LLC | 1.49M | 2.32% | +116.6K | Aug 12, 2026 |
| Invesco Ltd. | 1.17M | 1.82% | +383.0K | Aug 14, 2026 |
| Value Aligned Research Advisors, LLC | 1.05M | 1.64% | +98.0K | Aug 17, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 12.60% | 7.42M | 13G | Oct 2, 2025 ↗ |
| Vanguard Portfolio Management | 5.31% | 3.41M | 13G | Jul 31, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| David H. Wang | director, 10 percent owner, officer: See Remarks | 902.7K | 1.41% | Jun 5, 2026 |
| Jian Wang | officer: See remarks | 253.2K | 0.39% | Sep 19, 2025 |
| Tracy Liu | director | 110.8K | 0.17% | Mar 12, 2026 |
| Sotheara Cheav | officer: See remarks | 100.0K | 0.16% | Jun 5, 2026 |
| Chenming Hu | director | 100.0K | 0.16% | Mar 19, 2025 |
| Lisa Feng | officer: See remarks | 50.0K | 0.08% | Mar 9, 2026 |
| Mark McKechnie | officer: See Remarks | 900 | 0.00% | Aug 21, 2026 |
2 ten-percent owners hold 17.31M shares by Form 4, outside the officers-and-directors figure above · 6 people have not refiled in the last 18 months (8.82M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 20, 2026 | Mark McKechnieofficer: See Remarks | Sale · 3 lots | 55,199 | $77.27 | 900 |
| Aug 18, 2026 | Haiping Dundirector | Sale · 3 lots | 5,000 | $81.13 | 0 |
| Jun 4, 2026 | David H. Wangdirector, 10 percent owner, officer: See Remarks | Sale · 5 lots | 40,002 | $85.80 | 802,708 |
| Jun 3, 2026 | David H. Wangdirector, 10 percent owner, officer: See Remarks | Sale · 6 lots | 60,000 | $90.05 | 802,708 |
| Jun 5, 2026 | Sotheara Cheavofficer: See remarks | Sale · 4 lots | 5,399 | $83.18 | 100,002 |
| Jun 4, 2026 | Sotheara Cheavofficer: See remarks | Sale · 3 lots | 13,351 | $85.15 | 100,002 |
| May 19, 2026 | Haiping Dundirector | Sale · 4 lots | 5,000 | $66.22 | 0 |
| Apr 17, 2026 | Charles C. Pappisdirector | Sale | 5,000 | $52.00 | 0 |
| Mar 11, 2026 | David H. Wangdirector, 10 percent owner, officer: See Remarks | Sale · 2 lots | 60,000 | $47.92 | 802,708 |
| Mar 12, 2026 | David H. Wangdirector, 10 percent owner, officer: See Remarks | Sale · 3 lots | 50,000 | $45.58 | 802,708 |
CongressHouse and Senate disclosures
Not reported.